Overhauling of ESP of 300MW Unit 7 DPL under AHPEM DPL

Overhauling of ESP of 300MW Unit 7 DPL

Dry cleaning work: Dry cleaning of ESP starting from ESP inlet duct, all ESP hoppers, gas distribution screens, all emitting electrodes, collecting plates & other allied zones

LP Water Jet cleaning: Water jet washing of total ESP internal including all hoppers, collecting plates, emitting electrodes & other allied zones. At the time of water washing if any chokage is found in the hoppers, the same shall be cleared immediately. All arrangements including hose & LP pressurizing pumps for the job has to be arranged by the vendor

EERM system: checking & rectification of emitting rapping system of all the ESP fields thoroughly including housing bearing assembly (checking & replacement if needed); job includes replacement/repair & alignment of rapping shafts, bearings, pin wheels, hammer assembly of all rapping system if required after checking of all ESP fields.(Max. 20% of total qty)

CERM system: : checking & rectification of collecting rapping system of all the ESP fields thoroughly; job includes replacement/repair & alignment of rapping shafts, bearings, pin wheels, hammer assembly of all rapping system if required after checking of all ESP fields. (Max. 20% of total qty)

Support insulator system: Replacement/Repair (Max 20% of total qty) & cleaning of insulator & heater (100% of total qty)

Hopper heater: Replacement/Repair (Max.20% of total qty) & cleaning of heater (100%)

GD screen: Replacement (Max. 20% of total qty)/Repair & alignment of inlet GD screen (three stages)

Anvil pads: Replacement/Refitting of anvil pads of all collecting plates of ESP fields, if required after checking.

Shock bar system: Repair & alignment of shock bar

Baffle plates: Repair/refitting of baffle plates of all ESP hoppers (56 nos)

CERM & EERM Gear boxes: Lubrication of collecting & emitting rapping motor & its gear box. Servicing/rectification/replacement of gearbox if needed.

ESP field meggering: Meggering of all ESP fields & rectification if necessary until it reaches the desired value.

TR sets: The entire transformer rectifier set should be inspected thoroughly. Cleaning of the TR body, checking of oil level, top up if necessary, changing silica gel; OC & SC test of all 28 TR sets.

HV safety breakers: alignment of all safety breakers to be checked & rectified.

ESP MCC panels: All the MCC panels & incomer breakers including two nos dry type transformers to be cleaned & tightness checked.

Suspension frame & I beam: checking & rectification of suspension frame & I beam of A pass & B pass. Suspension point of collecting plate & emitting wire also to be checked.

ESP & inlet/outlet duct Manhole doors: inspection & repair of all manhole doors & replacement of all rope gaskets.

ESP hopper liner welding; Inspection(Demetering) & repair of hopper walls/liner welding by scaffolding of all hoppers

Inlet guide vane: checking/repair/replacement & strengthening of ESP inlet guide vane

ESP hopper ACC checking: ESP hopper DLI probe & controller checking/calibration/replacement

Shaft insulator system: Replacement/cleaning of shaft insulators & heaters

Gap adjustment of all plates: thorough checking of all collecting plates, straightening of plates if required. Gap adjustment between collecting plates. Inspection & replacement of emitting electrodes & field alignment

Fixing/repairing/realignment of collecting plates at suspension points & shock bar portion of all ESP fields as per requirement